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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0e644e7e78166d5c3b550c44ac4ddf27361642069eb04909595f2dc47c6455' 
  AND token = 'ZRfyeubksUVBMulGecJ6LdZ3aRbfWz08AnM+rgMIgd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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