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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9de6a1b99cc388e7574750cc53a75d74480a5a438286396f277952700ac7e9' 
  AND token = 'kJiAwCr7rF7IXFgZx4rgSF/LGm7yumdip3lrY0fyBGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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