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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c911b293177bc601c8516f4760ac0d4e88de4966d2b8b7492c8c1d13a3a5682' 
  AND token = 'p2Fw+nGf8RPFsQ/N9r3bGE2SDJCb/pMdLUzUuFHxGN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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