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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0babab51ac7eff0b996f4624d0bfc8d084e831d254b83968780bcf33893818f0' 
  AND token = '+5kA6tjy6lZvDhgSWr/dt5UjLDkzUjVW0IajBHRmyso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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