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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce82d234a0eb9f96efad4117bfed40ce0e56261ff7a2424c11a509814af69be' 
  AND token = 'G0+Yatbhb0TYtDYX85JGAA1q1nS2ToaIApnxQVXqzr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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