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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e0ad41379814d3feac10498a6a0e13b0a2e100db27b141c90e886346fa6acf' 
  AND token = 'xA6V89iiRInk95ZjlpG89Jr4+4LZgw3BGhpb/AuqKSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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