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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1db12a25aedb5bb2938bedb5ad559a4e93ddb288564b9903675faa50add31a0' 
  AND token = 'R14/jYE5UvHF+1HwtsDYs371Z3JTpq5J4pg/kPOxvAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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