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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df72488e8b266a19a6b110685c283698f02acc162dc3c080f373bd921271345' 
  AND token = 'Us982z2PCDDefRMNA4tr0NBzvmy3NTHovAptixEbW+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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