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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4fa9edf9662b27eb72f22d0ac7252a5d804f1bf2da354b213e43c20b55ae589' 
  AND token = '9XZJmJV8G9IIm5RjKV8M8FAuMBuvpR/FMTJcD7peCuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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