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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada15400ff2d44116d490146e32bad37bb3a340072f774262bb48498f70dee55' 
  AND token = 'm3jx4tWD9qBg06amttH6KllLCnXHg9Kn2Ro4QHef+zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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