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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9134692b97249544afa39d762fd128495826b956ababf2b6fd94b9b1f8dc4a' 
  AND token = 'P7QcafkLVgMFEd3u1kIkcTWiA7BwDr16azZ9q/Ry19c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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