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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abbd114b4611545fceff5139fc40a960a0b308ca0471baf562bc89c4da273aa4' 
  AND token = 'XExwR8DoisR4GsGaFborDWYg+dkr2bicw5zdkv4Scx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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