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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa63b921c076d0114de140598a1386e62c38873d415d9c859bd753f3552694fd' 
  AND token = 'ssKu58p2Hdkr2ho7/uVddjzRAjN7UkgcvktfPqod7Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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