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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c81179b9ffa976086e3e1835bee72c3514834bf6b375bc8479b9f07cdf5263' 
  AND token = 'TLj03z9BLzQwtRqJ0BcIMF9TRg2MsAarKg79bPexuXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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