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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f170d5dd3cf2c5ac72440e909f6d0d761823823ed9f709f8379bc514e02255a2' 
  AND token = 'eSfLG1ESO1c52OkoXBWnyOC92WakdUdOwIpdKgLh+Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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