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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a050ac4064245b2d9579987369627175f7e27877e32d9333294b5bf9a2ae720' 
  AND token = 'pd6kooXdXh0sBG0Rr1WApiLoBdJL5hcFGSkVEFk4BBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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