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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88f7aba247d1d75a080db29378f3c6410bc824add362abd098bc64ac1a8d80d' 
  AND token = 'Zk91t1etJerwWiQVJngsYEv6Oy5gGt1H0Ny5kNgmpB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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