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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db41b71686e36149a1f32248842e9ecfbe0e4e3d645a313a2336404fd0025ab' 
  AND token = 'ggpxvFmy88jdaJKKS4kvmoY7BJhkgAAnCDKSBI3amfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}