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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d83b2e16fa1aef075ad943cae49dbd7a2c3b3c68fa49cdbabc10762682a12b' 
  AND token = 'W7gmbSHt73RZDfd4ea4FEzsE3OPFTuqFmxaYl/qmW/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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