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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf05dcb4e35831801d9373b65c58cfb95f467ae2dd5e63b793c6f2437ba4cab9' 
  AND token = 'c/fp1SDsMITQbIAGpU3EtzqWnVW6RJU1Myz5fe2sjRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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