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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0419fcaf297a67082efc7c1f3582a20f2e140231cf7aeeb3fc34309cf225e8f0' 
  AND token = 'RDypmA6pP3gr6UuhldAD84rBR3oFGEE+kQCLXa33isU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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