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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7538d32a57ec7598af4db3d0fd1d992f8f3b03213c4945b597760dde375fe269' 
  AND token = 'w2e43Kwgr/KkzcN4apblX9nl/4WqjUWmwnjbH3/Kb2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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