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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2997cc22c74dabd4ebde32b374a6c775ac3a715d53eb50d571dafcd1bef8919' 
  AND token = '0t4jl81wkcoCAz6+BilIaU7Nfb+Pjm14bLCr9fb74OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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