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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a65c4c0e0b10c2307a60ca039e4a029e49d7593ca2f29b0f7ede731c2859688c' 
  AND token = '9N5m7K39TWqv1a3MZKIepjR2bUZcZR+V+1fl/OzYC4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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