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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c876b0036951f116afe57bebf0ea7b1a50f9eeea40af256043ac50b9b39ba7a2' 
  AND token = '6aLNJMx0AvJuaF177HN01o8blXXT2nH0Vr+M4y5UngM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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