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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa82a1f9fe514c2df014c07de5aec3c4fa20ac073a58e8d965136e4da9cdef2' 
  AND token = 'HjD9nWqeu4s/eMPKZhggmVBjVx01aRTYtaCnajVh0+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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