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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76b409ab75988fb950fe34eb9e4a05665aa4aece523624415133c631c13dd68' 
  AND token = '08zPTFxMNJAYTCL1s5swVV24C8cCQUH/hDnMj8Api78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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