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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c7af0a7414fa369e455783f17461e701a8545720be7b1c657c5a8734596300e' 
  AND token = 'V3d/NU1qMpHQBsWhznGfDOTBIFi63m7Tvk4z2gfgpYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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