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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86bce65e8ea8b569d38f7244a532f26f069cd33ea2618ef5dc290015367ce00' 
  AND token = 'ne3a0PmP+ijk/FZC0F3vafSoBha+BaJjmnJIKj0g0x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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