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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d230059a3c88f408c05cecbed71bd27ca1a17ee309686e35d3f1d4a4eb00f66' 
  AND token = 't8EvqH5/k71RjV48MatPPWxDXelHQq7vJJkuulLYozA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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