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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a044ab3bf4849ce5998acfb0adb6a15140467d11bc3a5e409e7a87139722d128' 
  AND token = '7jxbUVbW+Sg2O/BCkdRT9QIm75r/gmfhKwpcGi5dwS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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