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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70ef03d32bba1348a992aba66492a0a34c74b192cdeb3d2cf90e0c4f6df1c40' 
  AND token = 'rR6wzBc4RKYpS6uI/WIbqIbGTOsdRWHnHE7g6hbYlnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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