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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fecb153c99c1665dfc963bef3efa2f4bbb1145369601c25f013c119c1f79be56' 
  AND token = '0alVELBAGqGS6MMiN/oMY4rMKkmihbpxxlkX/STTyis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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