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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79fcff0588fc87cdf5442aa5dff01b9149b59cee5c8d6eab39c55e74fc443e4b' 
  AND token = 'yh6JdT8DHz/gRE6erNl14u24disw5mxo8CcFUdVuxX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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