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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a605a029603d572c3c51a46670c1c0303b2c8a2f00ec808201966b102d14b139' 
  AND token = 'niFYY1s6xG0ukzdVO204POr0/hwsQXxgWWa01H0D3FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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