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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd6b52b0e074fe1d861709a7d49b68a0fe51f46317e87f806eca77a8612e0d4' 
  AND token = 'HnGOA+bpCDfjeT1emzGRKrdyjmiivBv5aNcByxwW8d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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