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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386cb3cd27f6cde63f08c5208ae1c6862e65284ac7048c707abc32520db9e569' 
  AND token = 'AvUxYP+IuuZY32VhTt2p2RhbR9I1u0pnJS/K9/xulZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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